CO浓度对316L不锈钢准平衡气体渗碳的影响

材料热处理学报, 2015, 36(10): 204-209.

CO浓度对316L不锈钢准平衡气体渗碳的影响

荣冬松 ^1, , 巩建鸣 ^2, , 姜勇 ^3, , 彭亚伟 ^4,

1.南京工业大学机械与动力工程学院,江苏南京,211816

2.南京工业大学机械与动力工程学院,江苏南京,211816

3.南京工业大学机械与动力工程学院,江苏南京,211816

4.南京工业大学机械与动力工程学院,江苏南京,211816

基金项目: 江苏省高校自然科学研究重大项目(14KJA470002) 国家自然科学基金(51475224) 江苏省普通高校研究生创新计划资助项目(CXZZ12 _0420)

关键词：准平衡气体渗碳 , 扩张奥氏体相 , 碳活度 , 纳米硬度 , 压缩残余应力

Effect of CO concentration on paraequilibrium gas carburization of 316L stainless steel

Keywords： paraequilibrium gas carburization , expanded austenite , carbon activity , nano-hardness , compressive residual stress

采用准平衡气体渗碳工艺,在不同CO浓度的CO/H2/N2混合气体条件下制备了表面强化层,研究CO浓度对316L奥氏体不锈钢渗碳层的微观结构、碳浓度分布、表面纳米硬度和残余应力的影响.结果表明,准平衡气体渗碳层为单一的扩张奥氏体相;当CO浓度小于30％时,渗碳层厚度、表面纳米硬度和压缩残余应力均随CO浓度的提高而提高,当CO浓度高于35％时,渗碳气体碳活度降低,渗碳表面强化效果降低;经470℃条件下准平衡渗碳20 h后,316L不锈钢渗碳层厚度最高可达30 μm,表面碳浓度增加至2.6 mass％,导致表面纳米硬度从3 GPa增加至9 GPa,并产生1300 MPa以上的压缩残余应力.

参考文献

[1]	Suh B S;Lee W J .Surface hardening of A[S]316 L stainless steel using plasma carburizing[J].THIN SOLID FILMS,1997,295(1/2):185-192.
[2]	C. X. Li;T. Bell .Sliding wear properties of active screen plasma nitrided 316 austenitic stainless steel[J].Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear,2004(11/12):1144-1152.
[3]	Li C X;Bell T .Corrosion properties of active screen plasma nitride 316 austenitic stainless steel[J].Corrosion Science,2004,46(6):1527-1547.
[4]	Lewis D B;Leyland A;Stevenson P R et al.Metallurgical study of low-temperature plasma carbon diffusion treatments for stainless steels[J].Surface and Coatings Technology,1993,60(1):416-423.
[5]	Michal G M;Ernst F;Kahn H et al.Carbon supersaturation due to paraequilibrium carburization:Stainless steels with greatly improved mechanical properties[J].Acta M aterialia,2006,54(6):1597-1606.
[6]	Y. Cao;F. Ernst;G. M. Michal .Colossal carbon supersaturation in austenitic stainless steels carburized at low temperature[J].Acta materialia,2003(14):4171-4181.
[7]	Martin F J;Natishan P M;Lemieux E J et al.Enhanced corrosion resistance of stainless steel carburized at low temperature[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2009,40(8):1805-1810.
[8]	Martin F J;Lemieux E;Newbauer T et al.Localized corrosion resistance of LTCSS-carburized materials to seawater immersion[J].ECS Transactions,2007,3(31):613-621.
[9]	Ceschini L;Chiavari C;Lanzoni E et al.Low-temperature carburised AISI 3316L austenitic stainless steel:Wear and corrosion behavior[J].Materials and Design,2012,38:154-160.
[10]	李朋,潘邻,张良界,杨闽红,朱云峰,马飞.奥氏体不锈钢低温气体渗碳的组织性能[J].中国表面工程,2013(02):97-101.
[11]	荣冬松;巩建鸣;姜勇等.奥氏体金属低温超饱和气体渗碳表面强化试验装置[P].CN103323355 A,2013.
[12]	Williams P C;Marx S V .Modified low temperature case hardening processes[P].US.6547888,2000.
[13]	Hans Jurgen GRABKE;Else Marie MULLER-LORENZ;Andre SCHNEIDER .Carburization and Metal Dusting on Iron[J].ISIJ International,2001(Suppl.):S1-S8.
[14]	樊新民;孔见;孙斐.材料科学与工程中的计算机技术[M].徐州:中国矿业大学出版社,2000
[15]	Sun Y;Chin L Y .Residual stress evolution and relaxation in carbon S phase layers on AIS1 316 austenitic stainless steel[J].SURFACE ENGINEERING,2002,18(6):443-446.

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